E-car motor fits into school backpack

September 06, 2013 //
By Christoph Hammerschmidt

Automotive supplier Robert Bosch GmbH has introduced a complete electric powertrain, which is particularly optimized for urban driving cycles. The SMG 180/120 provides an impressive torque of 200 Newton meters. It also suits to concepts with axle-split four-wheel drive.

The Bosch SMG 180/120 is a compact powerhouse for use in electrical powertrains. The motor weighs only 32 kilos and fits inside a typical school backpack. This makes it considerably smaller and lighter than combustion engines, yet it still packs an impressive punch. Bosch positions the engine as an all-around solution for electromobility. It accelerates quickly over the first few meters and can be installed in electric vehicles as well as hybrids.

Drivers can already experience the compact powerhouse in the smart “fortwo” electric drive and the Fiat 500e. But the permanent magnet synchronous motor can be used in hybrids as well. One example is the Peugeot 3008 diesel hybrid.

In hybrids, the electric motor supports the combustion engine with an output of up to 40 kW. In purely electric vehicles and plug-in hybrids, the SMG 180/120 delivers an output of 80 KW. Even at low engine speeds, the SMG 180 delivers up to 200 newton meters of torque.

Despite the power it develops, the electric motor works at over 90 percent efficiency. One unique selling point is that its efficiency has been optimized for urban traffic. As a general rule, the more efficiently an electric motor works, the greater the electric range of the vehicle.

The compact motor's second strength is the level of comfort it offers drivers. As is typical for electric motors, the SMG 180 includes a start-stop function and regenerative braking. Even shifting is a thing of the past, since the motor operates with only one conversion ratio. At up to 12,800 revolutions per minute, the motor's output speed is flexible and covers the entire range of applications. Reverse gear is no longer engaged mechanically, but instead by changing the direction of electrical current.

In addition, the motor is maintenance-free. It contains no mechanical wear parts which must be regularly checked or replaced. And drivers are relieved of one other irksome task, namely checking oil levels